WASHINGTON (CNN) -- Federal prosecutors have unsealed an affidavit that details a rendezvous in a Washington hotel room last month between a prostitute and a client who a source tells CNN was New York Gov. Eliot Spitzer.

Gov. Eliot Spitzer, with his wife, Silda, by his side, apologizes to his family and to the public.

The affidavit does not mention Spitzer by name, but a source with knowledge of the case said the subject identified as Client-9 is the governor.

Spitzer took office in January 2007 after serving eight years as the state's attorney general, when he rose to national prominence as a hard-charging prosecutor.

He has not been charged.

Spitzer, who is married with three children, went before reporters Monday to confess to an undisclosed personal indiscretion, saying he had acted "in a way that violates my obligations to my family, that violates my or any sense of right and wrong."

He did not acknowledge the allegations, which were revealed Monday in The New York Times, nor did he take questions. Watch Spitzer's apology »

His alleged involvement with the ring was caught on a federal wiretap, the source said.

The prostitute, identified only as "Kristen" worked for the Emperors Club, which charged between $1,000 and $5,500 an hour and operated in New York; Los Angeles, California; Miami, Florida; London, England; and Paris, France, according to court papers.

According to the affidavit, defendant Temeka Rachelle Lewis -- who is accused of working as a booking agent for the club -- wrote a text message Monday, February 11, asking the operation's day-to-day organizer to "pls let me know if (Client-9's) 'package' arrives 2mrw. Appt wd be on Wed." Prosecutors say the message was a reference to a deposit.

Don't Miss

In a later conversation, Lewis and Kristen discussed when the prostitute could take a train from New York's Penn Station to Washington's Union Station, the affidavit says. Client-9 would be "paying for everything -- train tickets, cab fare from the hotel and back, mini bar or room service, travel time, and hotel."

The affidavit says that, about 5 p.m. Tuesday, February 12, Lewis spoke with Client-9 on the telephone and told him that his "package arrived today." The client asked Lewis whom he would be meeting and, when told it was Kristen, said, "Great, OK, wonderful."

The two discussed how the woman would get a key to his room for a Wednesday rendezvous and how they could arrange credit for future services.

"Client-9 asked Lewis to remind him what Kristen looked like and Lewis said that she was an American, petite, very pretty brunette, 5 feet 5 inches and 105 pounds," the affidavit reads.

In a call to Lewis, Client-9 was told the balance would be $2,712.41, but Lewis suggested he give Kristen $1,500 or $2,000 more so that he would have a credit.

Spitzer facts

Time magazine names Spitzer "Crusader of the Year" during his two terms as New York attorney general.

Tabloids label him "Eliot Ness," because of his reputation for rooting out corruption, busting white-collar criminals and tackling organized crime.

Spitzer is known for prosecuting several prostitution rings.

He attended Princeton and Harvard, then became an assistant district attorney in Manhattan.

He worked for three New York law firms and decided to run in his mid-30s for attorney general.

The first-term Democrat had been considered a rising star in his party.

Spitzer is married and has three daughters.

According to the affidavit, Kristen called Lewis about 9:32 p.m. Wednesday, February 13, and told her she was in Client-9's room -- No. 871 -- at the Washington hotel.

Four minutes later, Client-9 was in the hotel, Lewis told Kristen in another call.

No more calls were logged until 12:02 a.m. Thursday -- Valentine's Day -- nearly 2½ hours later. At that time, Kristen told Lewis Client-9 had left and she had collected $4,300.

Lewis told the prostitute she'd been told that Client-9 "would ask you to do things that, like, you might not think are safe -- you know -- I mean that ... very basic things," the affidavit says.

Kristen told Lewis, "I have a way of dealing with that. ... I'd be like, listen dude, you really want the sex?"

"I don't think he's difficult," Kristen is quoted as saying. "I mean it's just kind of like ... whatever ... I'm here for a purpose. I know what my purpose is. I am not a ... moron, you know what I mean."

Spitzer, who built his career on rooting out public corruption as New York attorney general, became a national figure with a series of high-profile Wall Street investigations. He is also known for prosecuting prostitution rings. See a timeline of his life »

Now his lawyers may be questioned about how he paid for the alleged hotel encounter, whether the trail was concealed and whether any banking laws were circumvented as a result, the source said.

The investigation into the Emperor's Club, which began in October 2007, included evidence from a confidential source identified in court papers as a prostitute who worked at the club in 2006 and was given immunity.

It also included statements from an undercover officer who posed as a customer, more than 5,000 intercepted phone calls and text messages, more than 6,000 e-mails recovered with search warrants, bank records, travel and hotel records and physical surveillance.

Despite the high cost of the club's services, the job was not alluring to one potential employee, who sent an e-mail to the club's management January 28 after speaking to a friend who was working for the agency.

"I wasn't very happy to find out that it's only 500 ph + over 50% commission fees ... This is the kind of money I make very easily in photo shoots and the reason I wanted to join your site [was] to make an extra money."

She added: "The other think [sic] I was a little bit shock and confuse that she had a sex with him twice in an hour and without her taking her out for dinner before. ... So I am very sorry I don't think this is my kind of thing."

People who know Spitzer, 48, were surprised by the allegations.

"To say this is a shock is an understatement," said CNN senior legal analyst Jeffrey Toobin, who went to law school with Spitzer.

Toobin called Spitzer "the straightest arrow I know."

"I think there's no question if he is involved -- and I'm not saying he is, because we don't know all the facts -- I would say he'd have to resign," said James Tedisco, the Republican minority leader in the state Assembly.

Tedisco said that Spitzer's push to reform government "loses all validity if he was involved in something illegal like that."

The Republican Governors Association called on Spitzer, a Democrat, to resign to "allow the people of New York to pursue honest leadership."

"The American people are tired of corrupt and hypocritical politicians. The governor of New York is just another in the long list of politicians that have failed their constituents," said Nick Ayers, executive director of the Governors Association.

Spitzer's office, the U.S. Attorney's office in New York and New York Mayor Michael Bloomberg all declined to comment.E-mail to a friend